Adjustable platform



FIG. 1 is a front-right side perspective view of an adjustable platform showing my new design;

FIG. 2 is a rear-right side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The portions of the figures in broken lines form no part of the claimed design. 

CLAIM The ornamental design for an adjustable platform, as shown and described. 